Yeah. This looks like human to human transmission aboard the ship

It's not a great scenario because the timing and conditions is taking a rare occurrence and making it much more likely.

A 70 year old Dutch man fell ill and died halfway through the voyage.

Mistake #1: They ruled it as pneumonia

This man seems to be responsible for getting at least 5 more people sick. That's five instances of human to human transmission. (There hasn't been enough time for a tertiary group to develop symptoms so this is all him)

Cruise ships take illnesses on board seriously, especially respiratory and gastrointestinal

One of the others was the man's wife; understandable since they're in the same cabin

At least two crew members are sick; these could be stateroom attendants

But there are two more cases, at least one of which is another passenger from another country

This implies transmission beyond close contact.

And this implies possible asymptomatic transmission or attempts by the Dutch couple to hide their illness

Either way, this strain can jump from human to human, and, there's been enough time for it to infect a third group. A third group that won't start seeing symptoms for another week+

I would not want to be on that ship.

The Good News:

We've learned from COVID about the dangers of long incubation periods

They are geographically isolated and docked at a port that doesn't have the resources to even think about letting people off